A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Native copper occurs in basic lavas and interbedded conglomerates overlain by series of conglomerates, sandstones and shales; mine workings; work done by Bureau of Mines; sampling and analyses; copper occurrence is geologically similar to those of upper Michigan peninsula; percentage of copper in rock is low.
Native copper occurs in basic lavas and interbedded conglomerates overlain by series of conglomerates, sandstones and shales; mine workings; work done by Bureau of Mines; sampling and analyses; copper occurrence is geologically similar to those of upper Michigan peninsula; percentage of copper in rock is low.
Copper deposits of Douglas county, Wis
U S Bur Mines -- Report Investigations
Smith, M.C. (author)
1947
7 pages
Supp Plates
Report
English
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